Griffin Survivor: 4th gen. Touch, Black/Blue - Ridiculously Over-Engineered? Or The Perfect case for Your iPod Touch no Matter Where You're Headed? The best-selling iPod touch case* Integral display shield deflects wind and rain (Test: up to 200 mm/hr for 1 hour) Rigid internal frame protects against shocks and drops (Test: drop on flat concrete surface from 6'/1.8 m) Sealed ports block blown sand and dust (Test: up to 18 m/sec for 1 hour) Silicone cladding blocks vibration (Test: 18 hrs at 20 to 2000 Hz)